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Source - Inch

Inch (in) - Definition and Overview

What is Inch?

An inch (in) is a unit of length in the imperial and US customary systems of measurement. An inch was defined to be equivalent to exactly 25.4 millimeters. Inch is also symbolised as ″.

Summary

  • The inch is a unit of length in the imperial and US customary systems of measurement
  • It is equal to exactly 25.4 millimeters
  • Inches are commonly used in the United States and other countries that use the imperial system to measure a wide variety of objects, from the size of a television screen to the length of a piece of wood.

Author Information

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Rajesh V U

Full-Stack Developer & Storage Technologist | Creator of UnitSmash.com
Last updated: June 1, 2026

I am a Storage Technologist with strong experience in enterprise storage systems, Angular development, and web-based tools. I enjoy building practical calculators, converters, and utilities, and I also create original cartoons. I share my tools, articles, and creative work on my personal website, rajeshvu.com.